show that angle 1+ angle 2- angle 3=180
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since DAE is a straight line [sum of straight line is 180°]
angle4+angle1+angle 5=180°
°° angle4= angle2. { alternate interior angles}
angle5=angle3. { alternate interior angles}
=> angle1 + angle4+angle5=180°
=> angle1+angle2+angle3 =180°. [angle4=angle2 ,angle5=angle3]
angle4+angle1+angle 5=180°
°° angle4= angle2. { alternate interior angles}
angle5=angle3. { alternate interior angles}
=> angle1 + angle4+angle5=180°
=> angle1+angle2+angle3 =180°. [angle4=angle2 ,angle5=angle3]
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